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d in the building. In a similar attack, another passenger plane struck the Pentagon, leaving a gaping gash in the nation's military hub, killing all on board the plane and more on the ground. Within an hour, a fourth airliner went down near Pittsburgh, killing all aboard. According to the FBI, the planes involved in the trade center crashes were American Airlines Flight 11, a Boeing 767 en route from Boston to Los Angeles carrying 81 passengers, nine flight attendants and two pilots, and United Airlines Flight 175, a Boeing 767 also headed from Boston to Los Angeles. Officials said the plane